piem-inboxes: Allow :url values without a trailing slash

The piem-inboxes documentation says that the :url value must end in a
slash, which is confusing because 1) public-inbox does not require
this and has examples in its docs without a slash and 2) some spots in
piem already append a slash if needed.

Add a piem-inbox-get wrapper that ensures the returned URL ends with a
slash, and use it in all spots that retrieve an inbox's URL.

Reported-by: Jelle Licht <jlicht@fsfe.org>
Link: https://inbox.kyleam.com/piem/87y1l9ualg.fsf@fsfe.org
Message-ID: <20230603041100.200632-1-kyle@kyleam.com>

0 files changed, 0 insertions, 0 deletions